#简单查询 print(session.query(User).all()) print(session.query(User.name, User.fullname).all()) print(session.query(User, User.name).all()) #带条件查询 print(session.query(User).filter_by(name='user1').all()) print(session.query(User).filter(User.name == "user").all()) print(session.query(User).filter(User.name.like("user%")).all()) #多条件查询 print(session.query(User).filter(and_(User.name.like("user%"), User.fullname.like("first%"))).all()) print(session.query(User).filter(or_(User.name.like("user%"), User.password != None)).all()) #sql过滤 print(session.query(User).filter("id>:id").params(id=1).all()) #关联查询 print(session.query(User, Address).filter(User.id == Address.user_id).all()) print(session.query(User).join(User.addresses).all()) print(session.query(User).outerjoin(User.addresses).all()) #聚合查询 print(session.query(User.name, func.count('*').label("user_count")).group_by(User.name).all()) print(session.query(User.name, func.sum(User.id).label("user_id_sum")).group_by(User.name).all()) #子查询 stmt = session.query(Address.user_id, func.count('*').label("address_count")).group_by(Address.user_id).subquery() print(session.query(User, stmt.c.address_count).outerjoin((stmt, User.id == stmt.c.user_id)).order_by(User.id).all()) #exists print(session.query(User).filter(exists().where(Address.user_id == User.id))) print(session.query(User).filter(User.addresses.any()))
多条件查询例子:
from sqlalchemy import and_ words = ['%三%', '%猫%'] rule = and_(*[table.u_name.like(w) for w in words]) table.query.filter(rule)
限制返回字段查询
person = session.query(Person.name, Person.created_at, Person.updated_at).filter_by(name="zhongwei").order_by( Person.created_at).first()
记录总数查询:
from sqlalchemy import func # count User records, without # using a subquery. session.query(func.count(User.id)) # return count of user "id" grouped # by "name" session.query(func.count(User.id)). group_by(User.name) from sqlalchemy import distinct # count distinct "name" values session.query(func.count(distinct(User.name)))
Sqlalchemy查询的like mysql order by desc 倒叙排例子
res =Session.query(OnlineHistoryInfo).order_by(OnlineHistoryInfo.id.desc()).all() for i in res: print (i.task_run_user,i.id)
#网上的例子
query = (model.Session.query(model.Entry) .join(model.ClassificationItem) .join(model.EnumerationValue) .filter_by(id=c.row.id) .order_by(model.Entry.amount.desc()) )